How bad can bipolar disorder get?

I know for some, bipolar disorder can be easy to control. But how bad can bipolar disorder really get? Can someone go from extremely happy to extremely mad on a dime? And can it make someone so mad they'd act out?

Bipolar disorder can vary widely in severity. For some, episodes are manageable with treatment, while for others, mood swings can become extreme, ranging from deep depression to intense mania. Severe episodes may disrupt work, relationships, and daily functioning, and in some cases, increase risk of self-harm. Consistent treatment and support are crucial to keeping it under control.